Re: How-to predict pending dummy read of 6502 CPU?

From: groepaz_at_gmx.net
Date: Fri, 13 Oct 2023 14:04:45 +0200
Message-ID: <2527552.4XsnlVU6TS_at_rakete>
Am Freitag, 13. Oktober 2023, 13:55:12 CEST schrieb Frank Wolf:
> Yes... this would work for single byte op codes and some stack related
> operations
>
> but not for some indexed operations where such a memory access (it's
> actually
>
> not only dummy reads but also some dummy writes) happens if there's a page
>
> boundary crossing.

mmmh right, you'll need to keep track of the penalty cycles too.... that makes
it a bit less straightforward.

Perhaps using one of the 6502 variants that indicate "next instruction" on a
pin is an option?

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Received on 2023-10-13 15:00:04

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